package yuxi3;

//字符串拼接并返回String类型
@SuppressWarnings("all")
public class StringBuilderDem04 {
    public static void main(String[] args) {
        int [] arr = {1,2,3,4};

        String s = arrayToString(arr);
        System.out.println(s);

    }

    public static String arrayToString(int [] arr){
        StringBuilder sb = new StringBuilder();

        sb.append("[");

        for (int i = 0; i < arr.length; i++) {
            if(i==arr.length-1){
                sb.append(arr[i]);
            }else{
                sb.append(arr[i]).append(", ");
            }
        }

        sb.append("]");

        String s = sb.toString();
        return s;
    }

}
